Update liboi
Remove travis-ci status

Travis-ci build results are failing because of a failure to lookup git tag information rather than an error in the code itself. We'll add this information back in once I figure out what is going on with travis.
Moving installation instructions to the wiki.
Merge branch 'master' of github.com:bkloppenborg/simtoi
Added issue reporting and contributing documentation.
Sync contributing with wiki.
Fixed missing names in shader.
Updated example to latest format revision.
Imported guiCommon from gui-overhaul-threads.
Merge branch 'master' into develop
Switched to guiModel from gui-overhaul-threads.
Add, Edit, and Remove model now (mostly) implemented.
Remove old model GUI files.